Red tells his viewers to use PVC elbows, but the fittings he holds up are clearly just 180° "straight-through" pipe-couplers.
Red specifies using two 45° PVC elbows, but in the "gluing and passing out" scene, he is clearly using 90° (right-angle) elbows.
Red says that the lamps should be duct-taped to the "ends of the pipes", but there is clearly just one pipe, and the lamps are both attached side-by-side to just the one end.